Whats wrong with this particular code

<?php
$imgs = $_GET["img"];
$cod = $imgs = $_GET["cod"];
$id = $_GET["id"];
$imagem = "$cod/$id/$imgs";
$img = "";

$tam = 200;

$ext = @strtolower(end(explode(".", $imagem)));
if ($ext == "jpg" || $extensao == "jpeg")
$img = @imagecreatefromjpeg($imagem);
else if ($ext == "png")
$img = @imagecreatefrompng($imagem);
else if ($ext == "gif")
$img = @imagecreatefromgif($imagem);

$ox  = imagesx($img);
$oy = imagesy($img);

$x = $ox;
$y = $oy;

if ($x >= $y) {
if ($x > $tam) {
$x1= (int)($x * ($tam/$x));
$y1= (int)($y * ($tam/$x));
}
else {
$x1= $x;
$y1= $y;
}
}
else {
if ($y > $tam)
{
$x1= (int)($x * ($tam/$y));
$y1= (int)($y * ($tam/$y));
}
else {
$x1= $x;
$y1= $y;
}
}
$x = $x1;
$y = $y1;

$img_final = @ImageCreateTrueColor($x, $y);
@ImageCopyResampled($img_final, $img, 0, 0, 0, 0, $x+1, $y+1, $ox, $oy);

header("Content-type: image/jpeg");
imagejpeg($img_final);
?>

Code (markup):

Warning: imagesx(): supplied argument is not a valid Image resource in /home/xxxxx/thumb.php on line 16

Warning: imagesy(): supplied argument is not a valid Image resource in /home/xxxx/thumb.php on line 17

Warning: Cannot modify header information - headers already sent by (output started at /home/xxx/thumb.php:16) in /home/xxx/thumb.php on line 49

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/xxxx/thumb.php on line 50

 

Nevermind found out my mistake it was $cod = $imgs = $_GET["cod"];

 

Exactly that was the problem. But any way whenever you need some help, it would be a pleasure to help you out.

 

Im just starting to read and learn about php recently, can i ask was it because of the lack of space between $ and cod in that $cod = $imgs = $_GET["cod"];

Im brand new to the stuff, its all helpful to understand this better.

Hope you both dont mind me asking.

 

No it was because in this code

$cod = $imgs = $_GET["cod"];

Code (markup):

I Had to assign the value of $_GET["cod"]; to $cod which by mistakely i added another variable $imgs = which wasnt needed

 

Thanks very much for explaining Bohra, im glad that i asked.

 

No Problem Mate i guess any problem u have u can just post in this section some1 or the other does surely help out

Regards